Redaction: Just as the rest of the moralizing statements of Jaredite history may be laid at the feet of Moroni, this statement also is likely due to Moroni’s interepretation. It is the strong reinforcement of his theme that the promise that is tied to the land will be predictor of the prosperity of a nation.
When they walk uprightly before God, they prosper and “never could be a people more blessed than were they.” When they obey God, the promise of the land blesses them. Of course, when they cease to walk uprightly before God, the curse of the land will take it all away, as has already happened during the great drought.